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Dependency preserving decomposition

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Dependency preserving decomposition

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Dependency preserving R 1 =(A, B),R 2 =(A, C) - Lossless-join decomposition: R 1 \ R 2 = f A g and A! AB - Not dependency preserving (cannot check B! C without computing R 1 1 R 2) Database Systems Concepts 7.8 Silberschatz, Korth and Sudarshan c 1997 ' & $ %the decomposition would be lossy (in a manner different from the usual case of lossy decomposition), if null values occur in the left-hand side of the functional dependency used to decompose the relation. (Null values in attributes that occur only in the right-hand side of the functional dependency do not cause any problems.)